=BUILTINS.P() -> {"PDURATION",PDURATION;"PEARSON",PEARSON;...}
DEFINE( BUILTINS.P, LAMBDA( VSTACK( HSTACK("PDURATION", PDURATION), HSTACK("PEARSON", PEARSON), HSTACK("PERCENTILE", PERCENTILE), HSTACK("PERCENTILE.EXC", PERCENTILE.EXC), HSTACK("PERCENTILE.INC", PERCENTILE.INC), HSTACK("PERCENTOF", PERCENTOF), HSTACK("PERCENTRANK", PERCENTRANK), HSTACK("PERCENTRANK.EXC", PERCENTRANK.EXC), HSTACK("PERCENTRANK.INC", PERCENTRANK.INC), HSTACK("PERMUT", PERMUT), HSTACK("PERMUTATIONA", PERMUTATIONA), HSTACK("PHI", PHI), HSTACK("PHONETIC", PHONETIC), HSTACK("PI", PI), HSTACK("PIVOTBY", PIVOTBY), HSTACK("PMT", PMT), HSTACK("POISSON", POISSON), HSTACK("POISSON.DIST", POISSON.DIST), HSTACK("POWER", POWER), HSTACK("PPMT", PPMT), HSTACK("PRICE", PRICE), HSTACK("PRICEDISC", PRICEDISC), HSTACK("PRICEMAT", PRICEMAT), HSTACK("PROB", PROB), HSTACK("PRODUCT", PRODUCT), HSTACK("PROPER", PROPER), HSTACK("PV", PV))))
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